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Howdy! I guess, my answer a bit late for you, but maybe it will help others. For some reason, "View Image Details" from Text for image page link field do not pass into Lightbox rel attribute in D7, while in D6 it works ok. I'm not good coder, so I won't hack the module. Instead, I found a solution by using Views module.

All we have to do is just build a correct link. In Views create a view and add next fields:Content: Nid, Content: Title, Content: Path, Content: Image, Content: Image (yes, 2 same image fields). Exclude them all from display except last Content: Image. And then:
1) Content: Path - you need to go to field settings, Rewrite Results and check "Rewrite the output of this field" and place a link inside: <br /><br /><a href='[path]' id='lightbox2-node-link-text'>View Image Details</a>
2) First Content: Image should has Formatter as "Image URL" (you need to install Image url Formatter module).
3) Second Content: Image should has Formatter as "Image", Link image to "Nothing" and you need to go to Rewrite Results and check "Rewrite the output of this field". Put this link there:<a class="lbx" rel="lightbox[[nid]][[title][path]]" href="[field_image]">[field_image_1]</a>